Police Search Las Vegas Home of Michael Jackson's Physician
updated 07/28/2009 AT 01:15 PM EDT
•originally published 07/28/2009 AT 12:25 PM EDT
At about 9 a.m., officers in two cars were seen driving into the palm-lined entrance of Dr. Conrad Murray's gated Red Rock Country Club community in the suburb of Summerlin, 20 minutes from The Strip. About 30 minutes later, a third vehicle joined them. Across town, two officers went into the back door of the doctor's clinic in Las Vegas.
The searches come less than a week after authorities raided the Houston offices of Murray, who was with Jackson when the entertainer was stricken in his Los Angeles home.
"They're searching Dr. Murray's residence and office," a law enforcement source tells PEOPLE. "They're executing a search warrant. They're continuing to look for records and other aspects of the investigation. They're just looking for any information they need to help [in the investigation]."
Monday, CNN and Associated Press reported that investigators believe Murray was the person who injected Jackson with the powerful anesthesia Propofol the night before the singer died. Jackson regularly used Propofol to help him sleep, according to media reports.
With reporting by MARK GRAY and SARA HAMMEL